I've had a look around but didnt really find anything conclusive. The problem is that 50% of the time I get an 'unsupported video format' message and cannot access any stuff in my iTunes library on my ATV. Even if I start a movie pause it and go back to the main menu then go back to play the movie again the message sometimes pops up. The general consensus is that its a network problem, possibly interference, but from what ive read nothing is proving conclusive. I was just wondering if anyone else can shed any light on the problem? Apparently it only happens with people using HDMI and is non existent when using composite connection. Because of this the sync functionality is useless because to get the ATV to read the files again is to reconnect to the iTunes library which erases any synced content. I dont have an AEBs just a crappy netgear router so I dont have much control over frequencies etc.